[R] Shading underneath a line plot.

[jim holtman]

Is this what you want:

mydata <- c(268,251,254,250,244,246,247,243,241,243)
plot(mydata, type="o")
# choose a min y value
minY <- 240
polygon(c(1, 1:10, 10), c(240, mydata, 240), col='red')


On Fri, Oct 24, 2008 at 12:17 PM, Alastair Andrew
<alastair.andrew at cis.strath.ac.uk> wrote:
>
> Hi,
>
> I'm sure this should be fairly simple to do but I haven't found an example.
> I have 10 data points which are plotted as a line, I want to shade under
> this line with a colour. Other examples have shading under curves where
> there are two sets of data use polygons.
>
> mydata <- c(268,251,254,250,244,246,247,243,241,243)
> plot(mydata, type="o")
> polygon(c(ppp$total,length(ppp$total)), col="red")
>
> This gives me almost what I want but the line from the x-axis up to the
> first point on the line is squint. Could anyone suggest how to create my
> polygon so that it correctly shades underneath the line?
>
> Thanks,
> Alastair
> --
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>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?